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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac91f71f21a44b4f80fa591da85e58850c1a26bfd2e4b42c0d289c596697525' 
  AND token = 'ehqP5It+x6eoWZkG443/quuVXRGeWOpJYeXm0mMj5nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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