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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f91e435167fe4a607a6b5c3e8473a14d964e1801c2869340cc4e8ca4a38901' 
  AND token = 'IIZpENjeBgk4x/tSqdLK0CNva9prZOEQADAHCh0zYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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