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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be7e4dc1ac9a8685f091736d438281efcdf302044fa9c59eaada1db69684e98' 
  AND token = 'YHWcZZflgeAn0hrSdv70tJC5/P0+88FrA5r3Myqs6ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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