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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f35e66520df2c826f0dbaba75c69c25fa5d5d3f7f6e52a762cc903858751d6' 
  AND token = '6CbPuzTYuxUrsXXFFyzdqQeJOQIrx+1wQLUzy9LWg9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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