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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25585850f610b5b24d432c6724f527f7ef5e6ad56dcb2cb94f8c108a68f09d82' 
  AND token = 'SeHtUWYbWswhAeoltX2PIQXlOMykmReY5CT2tPBruUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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