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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adde8633d40046c4c1cfe5e9478051000389e681c3cee1d274271b5ad0787685' 
  AND token = '2Uixs9EsrN80I/u6GhOR+RbeImifRR/qrrd7qK2JWP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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