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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad70781ce9bfc91e967fca2119a0a2fc676f15bdaa8cfdcc9cf7eea3d87e28e3' 
  AND token = 'wcLjxEOJfYb5deU2dp+8rRuMXP/je3yZJvUt2bJWDi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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