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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9aa4be42518e1ef29434214b493488cd7f49fda96e44518e93ab6849befb89' 
  AND token = 'd/sTCv5mlD3xpTOPw1FjlJrNGiB/sv4E831BXhOMu58=' 
  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"
    }
  }
}