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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e93fb5fcf31f452f8e94aa6ca28ed3a44e227dd1d899669b144662b9824d46c' 
  AND token = 'LYso5Wpfy0MfWSeLPl1dNjin/a88blDyeqTwRaK0TzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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