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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5330078e992db9aa0925731619b28b7545100058d9942f63074242d3a91035' 
  AND token = 'SDfv3+Ioelegs28toHIs7uFo1Uk8bcuuzL49S9dfHKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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