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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5fbf7a7f3817a9a443f56ff47a00680dc4c46e21c5be8f0a8c3f81e8685a31' 
  AND token = '4l6YzSnIraf2hhrzDU1pS9hH2JXn6b0rRkpX4loXZiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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