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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05dd137cb6fd75b87ac6ebff65911fc99f62c5ec78ec29082d353bda7b34eed' 
  AND token = 'Xko9JVsX0fZHpDvO9zK+aVl6C02HDW7Joo5tj3+bygY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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