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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4447220314d97c8409cd0efea6ff7e0a5ca6b41cc9a56ca54e7f6f6dcd242a' 
  AND token = 'vFzrT4Miq5ss5uiyw78KSqIht/7nk/VjOJRzax3Kbb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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