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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4ea2b298a830cf006a4e557843cfda173af2f16753a50bde3ae6903bab6dab' 
  AND token = 'dl3po7zTojFD6LfUOr+ZAAVQ8ZlLaYhyFt4umEdr34o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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