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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0deff43c8c7365ce7124aabe81ce6e01ea24fd9effb4bc59c32c24b0d7fc82' 
  AND token = 'SKBgL5/1DgSZ+utf5ebWwE17k4N4Vs+2/5xZoGwsOa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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