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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c15b01115b0dfcf8a22ff453009ca0d7d7b7b5a1774612cecf8d41b71d464d5' 
  AND token = 'u2ZqlUdfdcR8N9JY3Uh9ttShkVwg9c4BoS2v5j9I6iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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