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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d890884d9c509b90088054f5bb802514b529fce086cb4ccc896ba40191298a6' 
  AND token = 'FrCq9tYnNK03HQcY5QPiyKIQ+4w4C28iXzw3ZXRkA54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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