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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9577f3048faf0d0ea96159b692c9f24415fe5953e118bd37f5e98617a034be17' 
  AND token = 'qew06xqnB5FF3hjjDHSgFS2qJS0YNA6Lem/oNVGeL5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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