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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba476f50e8141a0fc67ee05065fe66890f7240f51160f614c8e47ca50697102c' 
  AND token = 'af/084Xki4Z+BJihjLi0D6TrsjwDYE70vWcfUpw56U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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