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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab559ee510d8af5f6c5ec03c818662d9e261d9bd7d0629a2975800b86b64e395' 
  AND token = 'Bu+tVMLdLeOLd0T+TmjBNIUmM8BIMHs/dmLI+Zgiyqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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