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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccbc33477dcd89558c8076452e6146c25a5eb72ddd988b2aaa270890d47d7ec' 
  AND token = 'AsQZesM4Urz/sKenNuE4mEsWaM+rqUFTlCVZBjMMpJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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