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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd321143426fccb29814d9c0586609430d9ea1bc2ed96bf432db1e08f651118c2' 
  AND token = 'rYV0uY2BbNsGi7XGRhQ0wUCUt4aZjYCjHk+rm6emS+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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