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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d2afb9bda81e3be4f6e1c1579a6202aca74f1adeea29a1c2e2a9bcad0e5ea7' 
  AND token = 'iiDLVMUllqazQj56HgO2Ix0q6shmZnYoXanVO9ipQys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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