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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3aa9fc6968cd973e0027ff1b41cc4a17521236ab6285c0b0b568d41c521ff1c' 
  AND token = 'uWXrZXwc71XxbgdwubLBvVqcqAcTH9Y4gbCNIHfbSlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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