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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4154f1fbdfa58d1d8e1de08985135fda324598a58911d33d2ff857498161a2' 
  AND token = '+0b7MtgHJa1TNBtWnJ/Xohyhvsa0L9u4hPIT9d0SWhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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