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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4fa721c1534425293b4109f5824406453516217a69904f95080f7e4311e2a1' 
  AND token = 'V5tVmAjTAhnvSQ0qSk2QzTnDM3Kz2BF3YgIzIsLf/50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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