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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7aae2c09febca239b2a428a6db983a163a15b731294a1e15cc0c0e3edc8493' 
  AND token = 'bFGLE+HHyDRqRD+t1rjwblk8JWNOEnMOMjZRrEKB6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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