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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885d51542772eaf5ae24bdabb27e010bac44d17cdbd8c5364c0c418c2486a8d5' 
  AND token = 's9rONP1Nr8mMMW+SHcAPh3F80bzYsPY9rAGli7Ctv9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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