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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bcdc76ceb0dca743b7938236bed8f21b0224d21cd42bdc47757c4b6e84e9c7' 
  AND token = 'ywQrxM3ydZkny74qd9kxB40M3PiNZ5UTy9YTpWQ3j9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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