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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23093ef7d6c8d3d8e27a9f2bad863ab480666b62e3f56c4918c29c4dd2b6d8b0' 
  AND token = '3VuPr6hixYe3MXlpfbh8GL0W3iEeDvmN40aIzxE0Tok=' 
  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"
    }
  }
}