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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05687b48c8ffed632bea6f4926f80d8e74b120584d3edc56ea4ecddc7887a5d8' 
  AND token = 'VW8uJ0nnO8b2bbm0KMYrIcc33IkFBEkiIqWAnQv4/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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