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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9da6fe6f45eca341d94a510955b6dd8c4c14649f8262f76ea8b5fb8609aeb7' 
  AND token = 'q564JkYVpau8BYtJO8FMswgDjed16IfAl7ttrBPB/qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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