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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502013f61d1dc50f43fc4fdac718369be7c66b1c48f996b2db9f1c133657e8ef' 
  AND token = 'N0LbpH7jZ3KGumnykR0Bc3Jkf9I8dj6alEIPmzDDa54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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