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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc457f668359c7016c58af8c4c050b6c1389a2b03a05c8d4a0edcb44c08a0c3a' 
  AND token = 'gRpA3lNylUou0ylJglD5reCWD+lt+UMr7F8natpCuhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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