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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c4d0d5a2654a8c763a2c505e2ce8a7bf870966b94d5ec2abdf683b1c844df1' 
  AND token = '/9PnbKbbr/4yYRn/WkDuitShJ6mkLBr8/2HnXigJATM=' 
  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"
    }
  }
}