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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701b4736f79cca4cdd7cbf9e62e84b1cca928527a1dbbe7b686d4ecda10c39c7' 
  AND token = '4xzrR5FZ5hmeS7BVuoO2Ml94aWDLERX62Vm0gG7FOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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