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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d1e6fc6ad80cc2d6edefd7b82f1bfd00d3c57e126e31064a23ff08cf7a4199' 
  AND token = 'UxSVPnM2KBnRD20Tb7r6PwtyHyIKRlHabsWNhQEntik=' 
  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"
    }
  }
}