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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccb91e247a96270920385c3cef1e1700b7a5e21f7671d03a562becb85232f85' 
  AND token = 'IcjNhGFbsHvDs1kacOj5VsqBlgkcaY9+s3E0vExJ+oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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