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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cd9ae021311da7d4f8e5dacaeee02b88a241d6ba95f304237c819efc9811ce' 
  AND token = '9JVoZaHJqqVdN7gb8wcdaub3bt1BGmPg+Qr2Xsmam78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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