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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5027df6b7ceea020bd4996f599a95d53700fea96ab295335cb8d340deccc7ed9' 
  AND token = 'VbVe7RWSDivXyW9bjqFZ92lW9D5QfOddkfB829oU9C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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