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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d4884937db8a7c0fe6e94f6fdf6a3c89ea4446360781163c563fe6a3489ab3' 
  AND token = '6FDM9qBxtlf29rcmNMCgWx2U3M43Gd0JTLVgXwD9Gjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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