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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7856c2cf964b5b83eb7f08b10db85bd9a7bb49bef4b8b19eb19568f17615fdb7' 
  AND token = 'oJIu4QjKIKpl5LUn2Zox2/OV4Y5Kbdw9+aIA7ZqTQTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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