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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f280254b8ef3e5c4d8b65d6e32faad5b4187efa775e51639b9eb533480661e74' 
  AND token = '28AqWlhJeIEiDgkx/zogojcZvVh7JZxa0t/75Jv4Zxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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