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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302bfdedb533975849b2a98c8f094334497d4a3b8f87db95a48595654e6858ec' 
  AND token = 'rEuyXWqELaBNIC9GUSbJ1OtjW0a1V4XjHFHfm0B8Fmk=' 
  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"
    }
  }
}