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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa57edcc25a948ac9e46cb0aef1321a8ef568e79960f75505183a030adb107e3' 
  AND token = 'p6atEJADSNhtPHDUQyiiIKc4XRV7a9f3j/MLhPnfzXk=' 
  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"
    }
  }
}