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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eb047ef9fe87f4c81a1ea9e1fdcf0aaf87a4e9207bc221da6544b6a9078daf' 
  AND token = 'tLiaP4PzBkL9Pcs7V4gD5OF8RxjvjRCXZ1el02aPMLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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