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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb26ae6346a341c3e3493000271df0eb067de7b99e1ea604e51aeb8532de898' 
  AND token = 'j+I/lv7x7jJqDZS7dJW7OXVzRanjmttz2xFFVHTXAqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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