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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48479edd4b43d0c0c4c2c104fd12233df6482a5cf1cda3a2d998306c4ba5b56' 
  AND token = 'rCJflIDYwvuQre/K0ieYP7eO5zqz8SCA1VMfjQlYn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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