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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b3b6e965a0cd6387274d2790ad3576212851063538843f5a7958b1c53eb77b' 
  AND token = 'QRlh9opXesnjIabNNERMKs6S9eXdtXKDzu3DO0GiBAw=' 
  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"
    }
  }
}