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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393b3af5d0e91d6f2f61ca32630ec6867955664f1c3f063ef13241317a25a492' 
  AND token = 'JYcuvKmokhWW/e3PayR9Ym2JaIUT55Q38E6cMtb30Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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