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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92b427682d0245deba00b54c253b432b907c14a3b8d82f36abb199972d400bc' 
  AND token = 'ZL6HK9DX+e1C4BHVW1gn8tnVjyktS4bhvy7a9UoJMR0=' 
  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"
    }
  }
}