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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff03b2ed9da6cc9480e40c02925a6b50e38eb32bb051ac277f1dfa7e25ba8db5' 
  AND token = 'tpdD7o7a0HaM3bhoN50ANNWB+MBY1W6rC6KAwHkIhgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}