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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7185bd739148f80a8db098215c42d45275f9f3e0b10cab73c6f276162c6764' 
  AND token = '9LIf16v4FtalDWeeiACZXTmPYRYCRCDniJs3CfqYEvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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