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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc37d65daa541815d6cec3981e851a38593ddb2790086b2aeacb41b0a7cd9ac' 
  AND token = 'FoFLlSZy1X73y2GmDzzO6ftTd4Yka/hw8AtyQzwIUFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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