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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9a89298fee8f31d0762437f66fe5c1f569dc88d2b6edcf7891319cc7d46da3' 
  AND token = '9j3JepGx/6XCy6yFeDZia3E1vy3sgoqE1ovXPyYg6cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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